BIOL 121 Lecture Notes - Allele Frequency, Soapberry, Allopatric Speciation
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BIOL 121 Full Course Notes
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Evolution 6: sexual selection (insert notes from previous day ) Experiment examples to prove that females do show this choosing behavior. * runaway traits: are far beyond what would be useful for natural selection, however they continue because the females continue to choose them = reproduction. Examples of runaway traits: plumage of birds, heavy pigmentations to attract females. Pheromones are hormones that produce a chemical response in the opposite sex. Experiment: they had males and females from universities. 1 males had to sleep in a shirt tonight and no added chemicals (no washing or deodorant) and these shirts were then exposed to females. Mhc major histocampability complex a way to measure how genetically close someone people are. Result: they found the males shirts with different mhc (if they were not on the pill), those on the pill preferred those with similar mhc. Fertile = want someone very different genetically to have healthy offsprings.